Мезоскопическое несоответствие – новый взгляд на эпитаксию наноструктур

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Abstract

Напряжения и деформации, возникающие из-за мезоскопического несоответствия на границах раздела, могут оказывать разнообразное влияние на свойства поверхностей и осажденных на них наноструктур. Представлен краткий обзор причин возникновения и последствий мезоскопического несоответствия на металлических поверхностях и показано, как оно влияет на рост, структуру и морфологию тонких пленок и наноструктур на ранних стадиях эпитаксии.

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About the authors

Д. И. Бажанов

Московский государственный университет им. М.В. Ломоносова

Author for correspondence.
Email: dima@kintech.ru
Russian Federation, г. Москва

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Supplementary files

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2. Fig. 1. Sketch of the system (square island of Co36 on the surface of Cu(001)) and three-dimensional representation of relaxations (a). Vertical displacement of cobalt atoms in the island (b) and copper atoms (c) in the upper layer of the substrate along the direction <110>. The distance between the layers is d0 = 1.8075 A, the lattice constant of copper is 0 = 3.615 Å. Hydrostatic stress in the same island and substrate layer (d) [12]. The drawing is adapted from [1].

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3. Fig. 2. Evolution of the average mesoscopic mismatch m = (rb – r0)/r0 for square islands of cobalt (a) and copper (b) as a function of the size of the island N (the number of atoms growing from right to left); rb and r0 are the average bond lengths in the island and the volume of the copper crystal, respectively [13]. The drawing is adapted from [1].

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4. Fig. 3. Display of the positions occupied by Pt atoms on a Pt(111) cluster of ~145 atoms. The shaded marks are the positions of the atoms after diffusion, the unpainted ones are the atoms after deposition at ~20 K. When displayed, only one atom is on the cluster at any given time. The “bare” zone separating the central region from the edge of the cluster can be populated by atoms during deposition. The diagram in the lower right part demonstrates the adsorption potential on the island surface and the temperature at which certain transport processes are involved [14]. The drawing is adapted from [1].

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5. Fig. 4. Cu(111) surface with cobalt deposited in 0.4 monolayers at 290 K: experimental STM map (a) and the result of KMC modeling without deformation relaxations (b) and with their correct consideration (c). The figure is adapted from [1].

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6. Fig. 5. STM image in DC mode (8.0 = 3.6 nm2, offset voltage 0.2 V, I = 100 pA) of two Fe islands (∅⊘ ≈ 20 and 35 Å) [15]. The inset shows a visible height profile along the line. The drawing is adapted from [1].

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